From: Alexander Belopolsky <alexander.belopolsky@gmail.com>
Date: Tue, 23 Aug 2016 18:44:51 +0000 (-0400)
Subject: Issue #27834: Avoid overflow error in ZoneInfo.invert().
X-Git-Tag: v3.6.0b1~578
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=7c7c14696bc8728e6853fba7595d6125d4eff238;p=python

Issue #27834: Avoid overflow error in ZoneInfo.invert().
---

diff --git a/Lib/test/datetimetester.py b/Lib/test/datetimetester.py
index a0583072d9..e21d487a12 100644
--- a/Lib/test/datetimetester.py
+++ b/Lib/test/datetimetester.py
@@ -4477,11 +4477,11 @@ class ZoneInfo(tzinfo):
 
     @staticmethod
     def invert(ut, ti):
-        lt = (ut.__copy__(), ut.__copy__())
+        lt = (array('q', ut), array('q', ut))
         if ut:
             offset = ti[0][0] // SEC
-            lt[0][0] = max(-2**31, lt[0][0] + offset)
-            lt[1][0] = max(-2**31, lt[1][0] + offset)
+            lt[0][0] += offset
+            lt[1][0] += offset
             for i in range(1, len(ut)):
                 lt[0][i] += ti[i-1][0] // SEC
                 lt[1][i] += ti[i][0] // SEC